feedback1d WN: a field opened after 暴鸰's drop draws it without its bomb (UnitInfo.form)

The bomb-less mode lived only in the client that saw the fx 'phase' event. UnitInfo now
carries an enemy's recorded mode (unit.form, set by kitBombd at the release), and the
renderer keeps it on the unit info, so a field watched or rejoined later starts on the
*_2 clips.

test/sim/feedback1d-bombd.test.js

@@ -70,6 +70,7 @@ describe('D4 暴鸰: the bomb leaves the drone and lands', () => {
     assert.ok(Math.abs(relT - castAt - RELEASE) <= TICK + 1e-9, `released ${(relT - castAt).toFixed(3)} s after the trigger (OnAttack ${RELEASE})`);
     const phase = log.find(([, ev]) => ev[0] === 'fx' && ev[1] === 'phase');
     assert.ok(phase && phase[1][4].kind === 'bombed' && Math.abs(phase[0] - relT) < 1e-9, 'the model drops to its bomb-less mode at the release');
+    if (drone.alive) assert.equal(b.fieldMeta().units.find((u) => u.id === drone.id).form, 'bombed', 'a field opened later draws it bomb-less');
     assert.ok(hitAt != null, 'the bomb lands');
     assert.equal(firstHit.id, relEv[2], 'on the operator it was dropped on');
     assert.ok(hitAt - relT > TICK, `then flies (${(hitAt - relT).toFixed(3)} s at ${PROJECTILE_SPEEDS.droneBomb} tiles/s)`);